import random
import string

def generate_test_data(num_tests=10, max_len=20):
    test_cases = []
    for _ in range(num_tests):
        # 随机生成字符串长度
        len_ = random.randint(1, max_len)
        
        # 随机生成字符串，包含小写字母和括号
        s = ''.join(random.choices(string.ascii_lowercase + '()', k=len_))
        
        test_cases.append(s)
    
    return test_cases

if __name__ == "__main__":
    test_data = generate_test_data()
    for i, s in enumerate(test_data):
        print(f"Test case {i+1}:")
        print(f"s = {s}")
        print()
